I'm not doubting the performance of the G. I am merely pointing out that according to VW's database, the D is correct for my AXX engined GTi.
My tuners, Storm Developments also use the piston type D, as do JKM when they replace the factory DV on TFSI engines. That, and the fact that it is correct as per VW's system for my reg number, is good enough for me.
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Just because VW say it, doesn't make it true though does it.
The amount of people that have had poor service and incorrect information from VW says it all.